That includes the two birds hidden in this urban cityscape optical illusion.

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The image shows a picturesque dogwood tree in bloom on the corner of 120th Street and Broadway in Manhattan’s Morningside Heights neighborhood.

The plant is located in front of a stately old brick building with ornate stone outcroppings.

The structure houses the Gottesman Libraries, which serve the nearby Teacher’s College at Columbia University.

Many viewers would likely take a look at the tree first, since that’s often a prime location for birds looking to build a nest.

But they should think again.

There are no birds in the plant or in the bright blue sky above it.

The pigeons are actually sitting on the building’s cornice.

They can be spotted immediately to the right of the name “Pestalozzi,” which is carved into the building.

The name likely refers to Johann Heinrich Pestalozzi, an 18th and 19th century Swiss thinker and educational reformer.

He advocated for the education of the poor and created many of the concepts that remain foundation in modern elementary education, according to Britannica.

This is far from the only animal-themed optical illusion people can use to test their vision.

There’s a cat hiding in this unassuming image of a garbage can near someone’s home.

Another feline has managed to camouflage itself in this pile of logs in the middle of a picturesque forest.

Those looking for another challenge should try locating the frog hidden in this leafy green landscape.

There’s another fuzzy pet hiding in this brain-twisting optical illusion of a suburban landscape.

But this one may be even more challenging than the rest.

Only those with 20/20 vision can spot the three cartoon pigs not wearing a birthday hat in this image.

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